The rotary hearth calciner in calcinations device of Jinzhou Petrochemical Incorporation was cracked and burnt out at the joint be - tween water jacket and inner tube during its operation.
中国石油锦州石化公司煅烧装置回转炉下料管，在运转过程中水套与内管连接处发生了开裂和烧损。
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The liningless cupola is featured by that the furnace shaft, except the hearth section, is not lined but substituted by a heat-exchanging jacket (HEJ)which is made of heat-resistant metal.